Have an old-school tabula recta lying around? No? Then just print out the chart below. Nothing ensures better password security than this centuries-old cipher technique. Here's how it works, via Wikipedia:

Scientists have recently released a mathematical breakdown of the perfect handshake. The University of Manchester researchers discovered that nearly one-in-five people hate the handshake, listing complaints such as sweaty palms, limp wrists, gripping too hard and no eye contact.

Math is unreasonably effective in describing the natural universe. Anyone who's seen Walt Disney's Donald in Mathmagic Land knows this to be so. Well, the axiom works in reverse, too: The physical stuff of the universe can model math right back. And to great effect.